React.js is an open source JavaScript Library, sometimes referred to as ReactJS or simply React, that provides a view for data rendered as HTML. React views are typically rendered using components that contain additional components specified as custom HTML tags. React promises programmers a model in which subcomponents cannot directly affect enclosing components (“data flows down”); efficient upgrading of the HTML document when data changes; and a clean separation between components on a modern single-page application.

DISTINGUISHABLE FEATURES OF REACT.JS INCLUDE:

Simple and Declarative: React simply expresses how your app should look at any given point in time, and React will automatically manage all user interface updates when you’re underlying data changes. It is quite easy to create interactive User Interfaces as you can design simple views for each state in your application, and React will efficiently update and render just the right components when your data changes. Declarative views make your code more predictable and easier to debug.

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One Way Data Flow: React uses a mechanism which is expressed as “properties flow down, actions flow up”. This is a mechanism where properties, a set of immutable values, are passed to a component’s rendered as properties in its HTML tag. A component cannot directly modify any properties passed to it but can be passed call back functions that do modify values.

Virtual DOM makes it awesome for SEO: React creates an in-memory data structure cache, computes the resulting differences and then updates the browser’s displayed DOM efficiently. This allows the programmer to write code as if the entire page is rendered on each change while the React libraries only render subcomponents that actually change.

Architecture beyond HTML:  The basic architecture of React applies beyond rendering HTML in the browser. For example, Facebook has dynamic charts that render to <canvas> tags and Netflix and PayPal use isomorphic loading to render identical HTML on both the serving client. These applications are based on React.js and this is what makes these operations possible.

Ability to Build Composable Components: You can build encapsulated components that manage their own state and then compose them to make User Interfaces. Since component logic is written in JavaScript instead of templates, you can easily pass rich data through your app and keep the state out of the DOM. React is all about building reusable components. In fact, with React the only thing you do is build components. Since they are so encapsulated, components make the code reusable, testing and separation of concerns easy.

Easy to Update: The beauty of REeact.js really shines when your data changes over time.  It takes a different approach which is based on the process called “reconciliation”. This is an approach that makes it easier to build apps because the re-render is so fast (around 1ms for TodoMVC), the developer does not need to explicitly specify data bindings.

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Does not use Templates: React approaches building user interfaces differently, as opposed to web application user interfaces that are traditionally built using templates of HTML directives, it breaks them into components (i.e. it uses a real, full featured programming language to render views). This is seen as an advantage as by unifying your makeup with its corresponding view logic, React can actually make views easier to extend and maintain.

It is not an MVC framework: React is a library for building composable user interfaces. It encourages the creation of reusable User Interface components which present data that changes over time.

ReactJS is maintained by Instagram, Facebook, and a community of individual developers and corporations. Websites such as Imgur, Netflix, Bleacher Report, Feedly, Airbnb, SeatGeek, HelloSign and others are currently using React according to JavaScript analytics service Libscore. As of March 2016, React is among the top two open-source projects by number of tsars by GitHub and React is the 6th most starred project of all time on GitHub.

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  1. Thank you for your article it looks good and providing some valuable information

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